[Fred E. Krugar]

I keep reading about how the short runner intakes will make you loose tq. But what if you are in a boosted situation? Would taking the runners completely out make a diff or would it hurt matters? Please help me out with this. Thanks in advanced.

[SWEET2KSTANG]

depends on set up really. you can shorten runners and get kind of a happy medium, but it depends on runner length, heads, and cam combo as well. when youre boosted, it also depends on method of boost, volume, and pressure youre set at.

[Fred E. Krugar]

Well for the time being I was just going to run about 8# boost from a turbo. I have another motor froma mark viii that I was going to fordge the internals and bump the boost to about 13# ( of course I will have all the supporting mods for the extra boost). I also have another Cobra intake and was just gonna cut the runners completely out. Or I guess I could just fab a sheetmetal intake and just make the some runners of different lengths to see what is best. What do ya think?

[bitemark46]

If you cut the runners (assumming a b-head) less than 2" you can add timing in the low end to make up for any lost torque. I didn't loose any on mine and picked up 4rwtq at peak. Completely removing them even in a boosted motor will kill any low end.

[Fred E. Krugar]

So making a sheet metal intake with lets say 3" runners (because of removing the irmc plates) and separate runners for each intake valve (with the secondary runner with a smaller volume) may work. I may have to try this.

[na svt]

Originally Posted by Fred E. Krugar So making a sheet metal intake with lets say 3" runners (because of removing the irmc plates) and separate runners for each intake valve (with the secondary runner with a smaller volume) may work. I may have to try this.

3" runners way too short for any engine operating below 7500rpm.

[Fred E. Krugar]

So what length do you suggest I make the runners? Also would a larger plenum help?

[na svt]

On a boosted car that's under 7500 I would stick with "close to stock" length and plenum volume.

[Tang Stang]

Originally Posted by na svt On a boosted car that's under 7500 I would stick with "close to stock" length and plenum volume.

Agreed. Especially since you're using a turbo, I wouldn't take much off the runners.


I wish I had the option of having runners of any appreciable length.

[na svt]

Originally Posted by Tang Stang Agreed. Especially since you're using a turbo, I wouldn't take much off the runners. I wish I had the option of having runners of any appreciable length.

Longer runenrs are always an option unless the combo is PD blown.

[Fred E. Krugar]

So basically i dont need to bother with building me a new intake then. Am I understanding that correctly. I was just wanting to build me one that is similar to the new boss 302 intake. I have pretty much all the materials and equipment to build one. But it doesn't look like I am going to need to. But that titanium would have sure looked good under the hood lol.

[Tang Stang]

Originally Posted by na svt Longer runenrs are always an option unless the combo is PD blown.

Then it becomes an issue of "how tall of a hood do I want to run" or "do I really want to cut a hole in the hood".

Originally Posted by Fred E. Krugar So basically i dont need to bother with building me a new intake then. Am I understanding that correctly.

I'd run the "B" head Cobra intake as is with your planned setup.

[Fred E. Krugar]

Well looks like problem solved. Going with the original then. Maybe just polish the runners up as best I can then.

[na svt]

Originally Posted by Fred E. Krugar Well looks like problem solved. Going with the original then. Maybe just polish the runners up as best I can then.

You are correct. There are guys making well over 1000rwhp and running 8s with the stock intake.